---
product_id: 49495877
title: "W4 Mastic Sealing Strip White 19mm x 5m – Caravan & Motorhome Sealant Tape, Waterproof Non-Setting Mastic for Windows, Roof Lights, Vents & Trims"
brand: "w4"
price: "188.27 DT"
currency: TND
in_stock: true
category: "W4"
url: https://www.desertcart.tn/products/49495877-w4-mastic-sealing-strip-white-19mm-x-5m-caravan-motorhome
store_origin: TN
region: Tunisia
---

# 100% Waterproof Seal 19mm x 5m Precision Fit Flexible Non-Setting Mastic W4 Mastic Sealing Strip White 19mm x 5m – Caravan & Motorhome Sealant Tape, Waterproof Non-Setting Mastic for Windows, Roof Lights, Vents & Trims

**Brand:** w4
**Price:** 188.27 DT
**Availability:** ✅ In Stock

## Summary

> 💧 Seal Smart, Travel Confident: The Ultimate Waterproof Shield for Your Adventure Mobile

## Quick Answers

- **What is this?** W4 Mastic Sealing Strip White 19mm x 5m – Caravan & Motorhome Sealant Tape, Waterproof Non-Setting Mastic for Windows, Roof Lights, Vents & Trims by w4
- **How much does it cost?** 188.27 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/49495877-w4-mastic-sealing-strip-white-19mm-x-5m-caravan-motorhome)

## Best For

- w4 enthusiasts

## Why This Product

- Trusted w4 brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Flexible & Durable:** Non-setting mastic stays soft, preventing cracks from movement and vibration.
- • **Ultimate Leak Defense:** Keep your caravan dry and worry-free with trusted waterproof protection.
- • **Versatile Application:** Seals windows, roof lights, vents, doors, trims, and exterior joints effortlessly.
- • **Precision Width & Length:** Perfectly sized 19mm x 5m strip for narrow joints and trims.
- • **No-Mess, No-Wait Installation:** Apply instantly with zero curing time—seal and go!

## Overview

The W4 Mastic Sealing Strip is a 19mm wide, 5m long waterproof, non-setting butyl mastic tape designed for caravans and motorhomes. It provides flexible, durable sealing for windows, roof lights, vents, and trims, preventing leaks and cracks caused by movement. Easy to install with no curing time, it ensures a reliable, mess-free seal that keeps your vehicle protected on every journey.

## Description

W4 Mastic Sealing Strip White 19mm x 5m – Caravan & Motorhome Sealant Tape, Waterproof Non-Setting Mastic for Windows, Roof Lights, Vents & Trims : desertcart.co.uk: DIY & Tools

## Features

- WATERPROOF LEAK PROTECTION – Trusted W4 mastic strip helps seal out water in caravans, motorhomes, and campervans
- 19MM WIDTH x 5M LENGTH – Ideal for narrow joints, trims, and precision sealing applications
- FLEXIBLE NON-SETTING MASTIC – Stays soft and adaptable, preventing cracking from movement and vibration
- VERSATILE APPLICATION – Suitable for windows, roof lights, vents, doors, trims, and exterior joints
- EASY, NO-MESS INSTALLATION – No curing time required; apply and secure for a quick, effective seal

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00J0X1BUQ |
| Best Sellers Rank | 14,420 in DIY & Tools ( See Top 100 in DIY & Tools ) 314 in Sealers |
| Brand | W4 |
| Colour | White |
| Customer Reviews | 4.6 4.6 out of 5 stars (901) |
| Global Trade Identification Number | 05019328001168 |
| Included Components | Sealing Strip 5m |
| Item Dimensions L x W | 14L x 16W centimetres |
| Item Thickness | 19 Millimetres |
| Item Type Name | W4 W4 Narrow Mastic Sealing Strip - 5m x 19mm - White, |
| Manufacturer | W4 |
| Material | Butyl |
| Model Number | 00116 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Part Number | 00116 |
| Recommended Uses For Product | Sealing overlap joints, awning rails, roof-lights, vents, window surrounds, and external trims on caravans and motorhomes |
| Unit Count | 5.0 meter |

## Product Details

- **Brand:** W4
- **Colour:** White
- **Item thickness:** 19 Millimetres
- **Material:** Butyl
- **Product dimensions:** 14L x 16W centimetres

## Images

![W4 Mastic Sealing Strip White 19mm x 5m – Caravan & Motorhome Sealant Tape, Waterproof Non-Setting Mastic for Windows, Roof Lights, Vents & Trims - Image 1](https://m.media-amazon.com/images/I/613Js-CRpBL.jpg)
![W4 Mastic Sealing Strip White 19mm x 5m – Caravan & Motorhome Sealant Tape, Waterproof Non-Setting Mastic for Windows, Roof Lights, Vents & Trims - Image 2](https://m.media-amazon.com/images/I/41YfDCVoZGL.jpg)
![W4 Mastic Sealing Strip White 19mm x 5m – Caravan & Motorhome Sealant Tape, Waterproof Non-Setting Mastic for Windows, Roof Lights, Vents & Trims - Image 3](https://m.media-amazon.com/images/I/51roLBnsLML.jpg)
![W4 Mastic Sealing Strip White 19mm x 5m – Caravan & Motorhome Sealant Tape, Waterproof Non-Setting Mastic for Windows, Roof Lights, Vents & Trims - Image 4](https://m.media-amazon.com/images/I/41oOLxq9TeL.jpg)
![W4 Mastic Sealing Strip White 19mm x 5m – Caravan & Motorhome Sealant Tape, Waterproof Non-Setting Mastic for Windows, Roof Lights, Vents & Trims - Image 5](https://m.media-amazon.com/images/I/51qaUVP+KzL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Is this double-sided and sticky - so it would stick and seal polycarbonate sheeting to its wood frame?**
A: Not sure about sticking to polycarbonate but as a sealing strip it worked brilliantly to my motorhome GRP body!  The parts ultimately were screwed together so if this is the same assembly method you should be fine

**Q: Would this be suitable to fix a cycle rack leaking braket on the back of the moho - was thinking loosening, cleaning and then resealing with this**
A: I used it for reselling the Truma water heater flange to the outside of the caravan.    I found the mastic tape to be too thick and difficult to work with.     I think you would be better using CT1 Sealant or similar which I used to bond and seal the mounting feet of the Solar Panel, to the Caravans roof.    Hope this helps.

**Q: Is this tape double sided**
A: Yes it is, once the protective non-stick separator tape is removed.  It is simply there to stop the mastic sticking to itself and to aid installation.

**Q: Will it stick to silicone sealent around a van roof vent?**
A: Yes, it will stick to just about anything you apply it to.  However, I have resealed a roof light/vent before and what you are planning is not your best course of action.  You should remove the roof vent completely, and then use a silicone removal solution to remove the old silicone from both mating surfaces. Note, silicone should never have been used to seal it in the first place. You can buy a small bottle of silicone remover from Screwfix for around £5.  Then buy the wide mastic sealing strip, (Not the narrow).  Then refit the roof vent.  When you have screwed it down, any excess mastic that squeezes out can easily be removed by wiping it off using white spirits.

## Frequently Bought Together

- W4 Mastic Sealing Strip for Caravans & Motorhomes White 19mm – Weatherproof Sealant for Overlap Joints, Awning Rails, Roof-Lights, Window Surrounds & External Trims, Durable & Easy to Apply
- Sika Sikaflex-522 Caravan And Motorhome Adhesive Sealant – Weather And Mould Resistant – White – 300ml
- Sikaflex-522 weather-resistant, UV-stable, adhesive sealant (new version of Sikaflex-521 UV and Sikaflex-221i) 300ml black

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-08-30*